You can convert a list returned by a plural Inspector into a mathematical set. As such, you can perform typical set operations such as union and intersection.

You can create sets from individual elements, separated by semicolons :.

Sets cannot be directly represented in the debugger. To see the individual items in the list, use the elements command:

  • Q: elements of intersection of (set of ("to";"be"); set of ("or";"not";"to";"be"))
  • A: be
  • A: to

Sets also allow subtraction. For example, the following query returns the set composed of the elements 2, 3, and 4. Note that subtracting a number not in the original set doesn’t affect the result. You can convert the set back to a printable list, using the elements command: command.

  • Q: elements of (set of (1;2;3;4) – set of (1;5))
  • A: 2
  • A: 3
  • A: 4

The elements keyword iterates over the set object, returning the individual set elements as an ordinary list.